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Conclusion


The present research proposes an experimental approach for the optimization of the volumetric mix-design of HMA and DRY blends for sub-ballast in railways. The methodology adopted was the SGC (Superpave gyratory compactor) with a different number of gyrations according to the mixture. It has been proposed a method that considers the elastic behavior of the rubber and calculates its release of deformation after compaction.

However, additional work is needed to verify the robustness of the methodology using other materials and different sizes of recycled rubber, other ratios. Also, the procedure based on experimental approximations still lacks strong aspects of turning it into a widely accepted method. In fact, this work has considered a simplified system of a bituminous matrix (aggregates, bitumen, air voids and rubber) and has been considered the compression as a determining factor that is exerted in compaction. It is proposed as a future line to carry out studies to decide the effect of real temperature according to the climatic zone, the behavior of rubber and the mutual interactions between rubber and bitumen.

To prove a repeatable laboratory procedure is necessary to control all the variables to keep the mixing and compaction conditions consistent. Even if this methodology represents the first step towards a new SCR blends design approach, it provides promising results in estimating the final void content after thermal stabilization and curing in mixtures of asphalt with rubber.

The protocol followed during the mix production of test specimens in the laboratory has been justified, with a section, since the behavior of the rubber requires care in the post-compaction phase that does not occur in conventional HMA mixtures.



A key point was the fact that the binder exerts a high influence on the final mechanical response of all the mixtures studied. The service life of asphalt pavements will directly depend on the type of binder used, and thus an adequate choice is crucial to design more durable sub-ballast layers. Using rubber in railways construction is a sustainable solution that ensures consumption of massive quantities of these waste materials.

Compliance with ethical standard


The author(s) declare(s) that there is no potential conflict of interest, also confirm that the manuscript has been read and approved by all named authors and that there are no other persons who satisfied the criteria for authorship but are not listed. We further confirm that the order of authors listed in the manuscript has been approved by all of us and, that we have followed the regulations of our institutions concerning intellectual property.

Acknowledgements


The research presented in this presentation was carried out as part of the Marie Curie Initial Training Network (ITN) action, FP7-PEOPLE-2013-ITN. This project has received funding from the European Union’s Seventh Framework Programme for research, technological development and demonstration under grant agreement number 607524.

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CITE AN ARTICLE


Soto, F. M., & Di Mino, G. (2018). “Improvements in the mix-design, performance features and rational methodology of rubber modified binders for the thermal evaluation of the railway sub-ballast”, (IJRSM/F09/17) International Journal of Research Science and Management, ISSN: 2349-5197, Volume 5, Issue 2, February 2018].


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